Definition: You are given a question on nutrition. You are also given 4 answer options (associated with "A", "B", "C", "D"), out of which only one is correct. You need to answer the question by selecting the correct option. You should only answer with the choice letter, not the whole answer.
Input: The gut microbes metabolize L-carnitine into which metabolite that has been shown increase cardiovascular disease?

(A)choline (B)betaine (C)Trimethylamine (D)All of the above

C